I think if Sid wanted to go full tilt and win a scoring race he could probably do it still. But watching him play the past few years is very clear he understands the grind and takes his breathers now and then as many greats did when they hit the wrong side of 30. It's a marathon, not a sprint.
I'd love for him to grab one more Hart and Ross to make up for the pair he lost in his prime but it's probably asking for too much now, especially with guys like McDavid roaming around. Those types of awards are generally a young mans game. But if he were able to get a 4th/5th Cup and add say a 3rd Smythe then you'd have to really start seriously considering him for a spot as high as 5th.